Flight Reliability
AS 634 · Alaska Airlines
Las Vegas → San Francisco (LAS–SFO)81% of its flights flew this route. The rest (SFO–LAS) are included in these numbers.
- 68%
- Arrive within 15 minutes
- 9 min
- Average arrival delay
- 0.3%
- Cancelled
- 1 min early
- Median arrival delay
Based on 332 historical flights. Data through May 2026.
What the data says
The 12–3 PM departure wins.
AS 634 departing between 12–3 PM arrived on time 88% of the time, versus 8% between 6–9 PM.
Thursdays have been rough.
AS 634 arrived on time 78% of the time on Tuesdays and just 62% on Thursdays. That gap is worth planning around.
Lagging the Alaska Airlines network.
AS 634 arrived on time 68% of the time, versus 80% across the Alaska Airlines network.
It basically never cancels.
Out of 332 scheduled flights, only 0.3% were cancelled.
The breakdown
- Mon65%(52 flights)
- Tue78%(41 flights)
- Wed66%(41 flights)
- Thu62%(52 flights)
- Fri69%(52 flights)
- Sat78%(40 flights)
- Sun64%(53 flights)
- 9 AM–12 PM—(5 flights)
- 12–3 PM88%(58 flights)
- 3–6 PM66%(256 flights)
- 6–9 PM8%(12 flights)
Jun 63% → May 27% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 63% | 19 |
| July 2025 | 67% | 30 |
| August 2025 | 69% | 29 |
| September 2025 | 58% | 26 |
| November 2025 | 73% | 26 |
| December 2025 | 63% | 30 |
| January 2026 | 80% | 30 |
| February 2026 | 87% | 37 |
| March 2026 | 89% | 44 |
| April 2026 | 50% | 26 |
| May 2026 | 27% | 26 |
- Departures on time
- 70%
- Diverted
- 0%
- Flights flown
- 331
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 332 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.